Low [CVE-2026-77860] Denial of Service via 'serve-expired' code path bypass
This low-severity Red Hat Linux advisory covers CVE-2026-77860; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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Summary
Denial of Service via 'serve-expired' code path bypass. Red Hat rates this low (CVSS 3.7).
Weakness: CWE-675. Red Hat lists fixing advisory RHSA-2026:68590 with package unbound-main-1.26.1-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; and 1 more.
Affected products named by the advisory: Red Hat package: unbound.
- 1.20.0
- 1.26.0
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- unbound-main-1.26.1-1.hum1
- RHSA-2026:68590
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- To mitigate this issue, disable the 'serve-expired' option in the Unbound configuration. This can be achieved by setting 'serve-expired: no' in the 'unbound.conf' file. A restart of the Unbound service is required for the changes to take effect. Disabling this feature may impact the availability of stale DNS records.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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